Required functionality for continuous time-pondersource-com -> Tiki push

For https://github.com/federatedbookkeeping/timesheets/issues/27 we need to be able to push a given change (addition, update, or deletion of a timesheet entry) in time-pondersource-com to timesheet-dev3-evoludata-com.

Additionally, we should make it possible to configure this push to happen automatically.